# Relationship history for MSHA mine 2003337

Current hierarchy: **Arthur Bruce  Austin → Austin Sand & Gravel → Austin Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Austin Sand & Gravel → Austin Sand & Gravel; 2005-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arthur Bruce  Austin → Austin Sand & Gravel; 2005-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur Bruce  Austin → Austin Sand & Gravel; 2005-10-24 to current/open; source msha-controller-operator-history